code: def find_importer(obj):
      """Find importer of an object."""
      oname = obj.__name__
      for modname, module in sys.modules.items():
          if modname.startswith("__main__"):
              continue
          t = getattr(module, oname, None)
          if t is obj:
              return modname
      return None
  
file_path: lmfit-py/lmfit/jsonutils.py
imports: from base64 import b64decode, b64encode
  from io import StringIO
  import sys
  import warnings
  import numpy
  import uncertainties
label_desc: Use image node_id 1 for calling a global function with example usage: find_importer(obj) and returns: None, modname